Oscar doesn't want to fight Tony for 2 reasons.

1. He doesn't want deja-vu all over again when he fights another Mexican, like what he had when he fought JCC. His possible last fight, going out being booed{win or lose}, would probably put another dent in his crown of pride.

2. Tony will beat him unconscious. I can see Tony actually being down on the canvas a couple of times, but when Oscars fuel tank starts running low on gas those wheels are going to get knocked off and they'll need a tow truck to get him out of the ring. Oscar doesn't want to get even older over night and be laughed at for getting trounced in his last fight.